Number of cells in the 2nd rows of all deco polyominoes of height n. A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.
A134437
Number of cells in the 2nd rows of all deco polyominoes of height n. A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.
Terms
- a(0) =0a(1) =1a(2) =7a(3) =45a(4) =312a(5) =2400a(6) =20520a(7) =194040a(8) =2016000a(9) =22861440a(10) =281232000a(11) =3732220800a(12) =53169177600a(13) =809512704000
External references
- oeis: A134437